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-rwxr-xr-xagg/inc/agg_shorten_path.h66
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diff --git a/agg/inc/agg_shorten_path.h b/agg/inc/agg_shorten_path.h
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+//----------------------------------------------------------------------------
+// Anti-Grain Geometry - Version 2.3
+// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
+//
+// Permission to copy, use, modify, sell and distribute this software
+// is granted provided this copyright notice appears in all copies.
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+//----------------------------------------------------------------------------
+// Contact: mcseem@antigrain.com
+// mcseemagg@yahoo.com
+// http://www.antigrain.com
+//----------------------------------------------------------------------------
+
+#ifndef AGG_SHORTEN_PATH_INCLUDED
+#define AGG_SHORTEN_PATH_INCLUDED
+
+#include "agg_basics.h"
+#include "agg_vertex_sequence.h"
+
+namespace agg
+{
+
+ //===========================================================shorten_path
+ template<class VertexSequence>
+ void shorten_path(VertexSequence& vs, double s, unsigned closed = 0)
+ {
+ typedef typename VertexSequence::value_type vertex_type;
+
+ if(s > 0.0 && vs.size() > 1)
+ {
+ double d;
+ int n = int(vs.size() - 2);
+ while(n)
+ {
+ d = vs[n].dist;
+ if(d > s) break;
+ vs.remove_last();
+ s -= d;
+ --n;
+ }
+ if(vs.size() < 2)
+ {
+ vs.remove_all();
+ }
+ else
+ {
+ n = vs.size() - 1;
+ vertex_type& prev = vs[n-1];
+ vertex_type& last = vs[n];
+ d = (prev.dist - s) / prev.dist;
+ double x = prev.x + (last.x - prev.x) * d;
+ double y = prev.y + (last.y - prev.y) * d;
+ last.x = x;
+ last.y = y;
+ if(!prev(last)) vs.remove_last();
+ vs.close(closed != 0);
+ }
+ }
+ }
+
+
+}
+
+#endif